An unexpected token "CREATE TRIGGER - db2

Question

CREATE TRIGGER TRG_EFMREFNO
BEFORE
INSERT ON FEEDBACK_CASE_TB
FOR EACH ROW
BEGIN
SELECT SEQ_EFMREFNO.NEXTVAL INTO:NEW.EFMREFNO FROM DUAL;
END;
please help me it's give errors
An unexpected token "CREATE TRIGGER TRG_EFMREFNO
BEFOR" was found following "BEGIN-OF-STATEMENT". Expected tokens may include: "<revoke>".. SQLCODE=-104, SQLSTATE=42601, DRIVER=4.12.79
An unexpected token "END-OF-STATEMENT" was found following "END". Expected tokens may include: "JOIN <joined_table>".. SQLCODE=-104, SQLSTATE=42601, DRIVER=4.12.79
Please give the solution for that errors

Answer 1

You have 2 things going on here -
1) When the ";" character is part of the SQL statement, it's necessary to use a different character to terminate the statement. I typically use "#". To tell the "db2" command that you have chosen a different character, use
db2 -td#
or if you want to read from a file
db2 -td# -f <somefile>
2) The correct way to update new row in a trigger is to set an alias for the new row, and use a set clause:
CREATE TRIGGER TRG_EFMREFNO
BEFORE
INSERT ON FEEDBACK_CASE_TB
REFERENCING NEW AS N
FOR EACH ROW
BEGIN
SET N.EFMREFNO = SEQ_EFMREFNO.NEXTVAL;
END
#
There may be other ways to use the sequence with the default clause in the create table statement that will accomplish the same thing: